Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DA991C636CD for ; Fri, 10 Feb 2023 08:56:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231669AbjBJI4k (ORCPT ); Fri, 10 Feb 2023 03:56:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55822 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231667AbjBJI4g (ORCPT ); Fri, 10 Feb 2023 03:56:36 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D47B022DD5; Fri, 10 Feb 2023 00:56:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=JSTgJ5hV7SWofjt//iPhebk3gwe3dikCYa/+/r7DA9g=; b=TcH1SZiDVoQSCCtN8p+tfZ2305 O+KKBE0Yf/ssms2pfvLYnlHsKokgSIiBrOlzMGkLWrL7gAN1SFhC1md9SXCZEdTT+smgoTeHdPHCi aXNz/LuGsQGYRwSnWlo1QthDxUpiKSH63TRPvfKhduZZYvPlSKboBlW9K/dzRSHU0i/1uzJXGAV7s RgeKCY3repcaqByfiDHuilOf/xwDxFULmZ5xQ2ZTXgCfFWUzq5p8W7Ek6rAAyypFETwzJD1PpE548 IqNe2BHz+wbnw9AsJ/B8M7FJeWCWzvumg18HdkjnJIKds/a0mEflq37Rtwlm3vwbEMhoZue4X+ePA NWgxSReQ==; Received: from [2001:8b0:10b:5::bb3] (helo=u3832b3a9db3152.infradead.org) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pQPC9-002xz6-SL; Fri, 10 Feb 2023 08:55:51 +0000 Message-ID: <6fc16f3048719058bccce9d488bcb75252f49031.camel@infradead.org> Subject: Re: [External] Re: [PATCH v8 8/9] x86/mtrr: Avoid repeated save of MTRRs on boot-time CPU bringup From: David Woodhouse To: Thomas Gleixner , Usama Arif , kim.phillips@amd.com Cc: arjan@linux.intel.com, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, x86@kernel.org, pbonzini@redhat.com, paulmck@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, rcu@vger.kernel.org, mimoja@mimoja.de, hewenliang4@huawei.com, thomas.lendacky@amd.com, seanjc@google.com, pmenzel@molgen.mpg.de, fam.zheng@bytedance.com, punit.agrawal@bytedance.com, simon.evans@bytedance.com, liangma@liangbit.com Date: Fri, 10 Feb 2023 08:55:48 +0000 In-Reply-To: <878rh61jqx.ffs@tglx> References: <20230209154156.266385-1-usama.arif@bytedance.com> <20230209154156.266385-9-usama.arif@bytedance.com> <87mt5m1yiz.ffs@tglx> <9b6bca9c-7189-a2d5-8c0a-f55c24f54b62@bytedance.com> <878rh61jqx.ffs@tglx> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-iJC8552PsSC9dk3v0Lo3" User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-iJC8552PsSC9dk3v0Lo3 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2023-02-10 at 00:50 +0100, Thomas Gleixner wrote: > On Thu, Feb 09 2023 at 20:32, Usama Arif wrote: > > On 09/02/2023 18:31, Thomas Gleixner wrote: > > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0first_cpu =3D cpuma= sk_first(cpu_online_mask); > > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0smp_call_function_s= ingle(first_cpu, mtrr_save_fixed_ranges, NULL, 1); > > >=20 > > > So why is this relevant after the initial bringup? The BP MTRRs have > > > been saved already above, no? > > >=20 > >=20 > > I will let David confirm if this is correct and why he did it, but this= =20 > > is what I thought while reviewing before posting v4: > >=20 > > - At initial boot (system_state < SYSTEM_RUNNING), when mtrr_save_state= =20 > > is called in do_cpu_up at roughly the same time so MTRR is going to be= =20 > > the same, we can just save it once and then reuse for other secondary= =20 > > cores as it wouldn't have changed for the rest of the do_cpu_up calls. > >=20 > > - When the system is running and you offline and then online a CPU, you= =20 > > want to make sure that hotplugged CPU gets the current MTRR (which migh= t=20 > > have changed since boot?), incase the MTRR has changed after the system= =20 > > has been booted, you save the MTRR of the first online CPU. When the= =20 > > hotplugged CPU runs its initialisation code, its fixed-range MTRRs will= =20 > > be updated with the newly saved fixed-range MTRRs. >=20 > I knew that already :) But seriously: >=20 > If the MTRRs are changed post boot then the cached values want to be > updated too. They are, aren't they? The only way we come out of mtrr_save_state() without calling mtrr_save_fixed_ranges() =E2=80=94 either directly or via smp_call_function_single() =E2=80=94 is if they've already been saved once *and* system_state < SYSTEM_RUNNING. I suppose we could make that clearer by moving the definition of the mtrr_saved flags inside the if (system_state < SYSTEM_RUNNING) block? @@ -721,11 +721,20 @@ void __init mtrr_bp_init(void) */ void mtrr_save_state(void) { int first_cpu; =20 if (!mtrr_enabled()) return; =20 + if (system_state < SYSTEM_RUNNING) { + static bool mtrr_saved; + if (!mtrr_saved) { + mtrr_save_fixed_ranges(NULL); + mtrr_saved =3D true; + } + return; + } + first_cpu =3D cpumask_first(cpu_online_mask); smp_call_function_single(first_cpu, mtrr_save_fixed_ranges, NULL, 1); } --=-iJC8552PsSC9dk3v0Lo3 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT 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